Long-term non-phosphorus application increased paddy methane emission by promoting organic acid and methanogen abundance in Tai Lake region, China
文献类型： 外文期刊
作者： Xu, Chen 1 ; Shen, Susu 1 ; Zhou, Beibei 4 ; Feng, Yuanyuan 1 ; He, Zhu 1 ; Shi, Linlin 5 ; Wang, Yu 6 ; Wang, Haihou 5 ; Mishra, Tripti 1 ; Xue, Lihong 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agro Environm Downstream Yangtze Plain, Nanjing 210014, Peoples R China
2.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Peoples R China
3.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China
4.Jiangsu Open Univ, Coll Environm & Ecol, Nanjing 210017, Peoples R China
5.Suzhou Acad Agr Sci, Natl Agr Expt Stn Soil Qual, Suzhou 215105, Peoples R China
6.Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China
7.Jiangsu Acad Agr Sci, 50 Zhongling St, Nanjing 210014, Peoples R China
关键词： Phosphorus; Paddy field; Methane emission; Methanogen; Methanotroph
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）
ISSN： 0048-9697
年卷期： 2023 年 864 卷
页码：
收录情况： SCI
摘要： Rice paddy is a significant source of atmospheric methane (CH4), a major global warming source. CH4 emission from paddy fields is greatly influenced by phosphorus (P) management, especially the long-term non-P application on CH4 emission is largely unexplored. In the present study, long-term non-P application (NK) and P application (NPK) treatments of two paddy fields in Suzhou (from 1980) and Yixing (from 2009), Tai Lake region was done. The effect of P application on CH4 emissions and related microorganisms (i.e., methanogens and methanotrophs) from 2019 to 2020 was analyzed. Results revealed that long-term NK treatment didn't alter the seasonal trend of CH4 flux, but significantly promoted CH4 emissions at the tillering stage. The non-P application for >12 years caused the cumulative CH4 emissions of NK treatment in the whole rice season significantly increased by 41.9-221 % in two fields compared to NPK treatment in 2019 and 2020. NK treatment increased the abundance and diversity of methanogens, while reducing the abundance and diversity of methanotrophs. Community composition of soil pmoA gene differed in two experiment sites. Correlation analysis revealed that the CH4 emission was significant and positively related to soil mcrA gene and C/P while negatively related to soil pmoA gene and P. Structure equation model analysis show the low soil available P content was the dominant driving factor for the high CH4 emission under long-term non-P application through its direct impact on soil mcrA and pmoA genes. The increased soil organic acid content was another driver which was positively related to soil mcrA gene and negatively to soil pmoA gene. Our findings demonstrate the impor- tant role of soil P in regulating CH4 emissions from paddy fields in the Tai Lake region, China, and suitable P applica- tion is necessary for ensuring the yield while reducing CH4 emission.
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